Fdtn

RENR5514-01 September 2003

FLUID POWER SYMBOLS
BASIC COMPONENT SYMBOLS
MAIN AUX.

PUMP or MOTOR

FLUID CONDITIONER

SPRING

CONTROL VALVES

RESTRICTION

LINE RESTRICTION (FIXED)2-SECTION PUMP

PUMP: VARIABLE and PRESSURE COMPENSATED

RBL2 MR

VARIABILITY

SPRING (ADJUSTABLE)

LINE RESTRICTION (VARIABLE)

PRESSURE COMPENSATION

HYDRAULIC PNEUMATIC ENERGYTRIANGLES

LINE RESTRICTION (VARIABLE and PRESSURE COMPENSATED)

VALVE ENVELOPES

VALVES

VALVE PORTS

34

NRL

bL6 bL3

bL5 bL2 bL1

PTA

bR4 bR2

bR5 bR3

ONE POSITION

TWOPOSITION

THREE POSITION

TWO-WAY

THREE-WAY

FOUR-WAY

bL4

bR1 PP

CONTROL VALVES
AB AB

CHECK VALVES

PSW

RBr3

RBL4 CLa2

P T NORMAL POSITION

P T SHIFTED POSITION

INFINITEPOSITION

BASIC SYMBOL

SPRING LOADED

RBL3

MEASUREMENT

ROTATING SHAFTS

PRESSURE

TEMPERATURE

FLOW

UNIDIRECTIONAL

BIDIRECTIONAL

bL4

bL3

bL2

bL1

bR1

bR2bR3 PBR3

33
RBL4 RBL3 dB1

20
PBR3

PB1 PP PSW

312C Excavator Hydraulic System
CBA1-UP CAE1-UP BNN1-UP FDS1-UP CBT1-UP BWH1-UP DBN1-UP

FLUID STORAGE RESERVOIRS

VENTED

PRESSURIZEDRETURN ABOVE FLUID LEVEL

RETURN BELOW FLUID LEVEL

COMBINATION CONTROLS

BL2 BRC BR2 BR3 ARC FA1 dA1 LCs LCPa1

SOLENOID

SOLENOID or MANUAL

SOLENOID and PILOT

SOLENOID and PILOTor MANUAL

SERVO

THERMAL

DETENT

MANUAL CONTROL SYMBOLS

BL1

BR1

BL4 BL3 LCa2 LCBR

LCb1

PUSH-PULL LEVER

GENERAL MANUAL

PUSH BUTTON

PEDAL

SPRING

LCO AL4 AL3AL2

AL1

AR1

AR2

RELEASED PRESSURE

PILOT CONTROL SYMBOLS

REMOTE SUPPLY PRESSURE

LCa1 AR3

RAL3 aL4 RAL4

EXTERNAL RETURN

INTERNAL RETURN

SIMPLIFIED

COMPLETE

INTERNALSUPPLY PRESSURE

ACCUMULATORS
aL3 RAL2 aL1 aR1 aR2 aR3
SPRING LOADED GAS CHARGED

CROSSING AND JOINING LINES

HYDRAULIC AND PNEUMATIC CYLINDERS
SINGLE ACTING DOUBLE ACTING

LINES CROSSING...